Picker-check means for looms



L. S. BURBANK.

PHIKER CHECK MEANS FOR LOOIVIS.v

APPLICATION FILED JAN-31,1919.

1,380,465, PatentedJupe 7, 1921.

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PICKER CHECK MEANS FOR. LOOMS.

APPHCATIOH FILED mmsnisw.

1,380,465. I PatentedJ'une 7,1921.

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LUDLow MANUFAC- TUBING ASSOCIATES.

PIGKER-CI-IECK MEANS FOR LOOMS.

- Specification of Letters Patent.

Patented June 7, 1921.

Original application filed November 23, 1917, Serial No. 203,497. Divided and this application filed Tanuary 31, 1919. Serial No. 274,293.

To all whom it may concern:

Be it known that I, Louis S. BURBANK, a citizen of the United States, and a resident of Ludlow, in the county of Hampden and State of Massachusetts, have invented an Improvement in Picker-Check Means for Looms, of which the following description, in connection with the accompanying drawings, is a specification, like characters on the drawings representing like parts.

This application is a division of my copending application Serial No. 203,497, filed November 23 1917, now Patent No. 1,294,- 872, dated February 18, 1919, for automatic filling changing looms.

This invention relates to looms and particularly to picker check means for looms.

In order that the principle of the invention may be readily understood, I have disclosed a single embodiment thereof in the accompanying drawings, wherein Figure 1 is a front elevation of a loom provided with my invention;

Fig. 2 is a front elevation on an enlarged scale of one end of the lay of the loom and of the upper end of one of the picker sticks, and showing my invention in operative relation to such parts;

Fig. 3 is an end elevation of the construction shown in Fig. 2; and

Fig. 4 is a vertical section of the construction shown in Fig. 2.

In the drawings of the application of which this is a division, I have represented a loom particularly adapted for weaving jute and other coarse and heavy fibers, but obviously my invention may be of general application.

Referring more particularly to the drawings, the sides of the loom are represented at 1, the breast beam at 2, the loom arch at 8, the lay at 4, the lay swords at 5, the

rocker shaft at 6, and the hand rail at 8. These parts may be of any suitable construction.

Power may be applied to the loom in any suitable manner and preferably by means of a driving pulley, not shown. Such driving pulley may be upon a usual drive shaft provided with a driving pinion to mesh with a gear upon the usual cam shaft, not shown. Such gear may mesh with a gear upon the crank shaft indicated at 9.

The pickers are indicated at 10, 10 and of such a glancing are herein shown as pivoted at 11, 11 in any usual manner and are provided with spr1ngs12, 12, tending normally to throw them to the outer position herein indicated. In Flg. 1, I have represented both of the picker sticks as in their outer positions, for clearness of illustration.

The said picker sticks 10, 10 are adapted to be operated in any usual manner and are herein shown as provided with straps 12, 12', which need not be further described. The loom herein disclosed preferably is a feeler loom, though my invention is not restricted thereto. It is of great importance in a feeler loom that'means be provided to stop the shuttle at the proper point and to prevent rebound thereof, since otherwise the feeler cannot enter the usual slot of the shuttle.

Heretofore and particularly in looms for weaving jute and other coarse and heavy fibers, the shuttle strikes the picker and rebounds upwardly, and the reaction or effect blow is in reality a cha ter rather than a rebounc Very commonly the friction of the binder limits this tendency to chatter by bringing the shuttle to rest after it has simply jumped up. 7 As this vertical play in the box has commonly been from three-eighths to one-half inch, it is obvious that such play cannot be tolerated or permitted when a feeler is used, since it is necessary to register the feeler accurately with the feeler slot in the shuttle. Moreover, the said upward rebound to which I have referred has caused excessive wear, both of the shuttle and of the box parts.

In accordance with my invention I stop the shuttle in a straight line, but do it gradually, thus preventing rebound.

The shuttle striking the top of either box indicated at 18, 13 is confined or prevented from substantial vertical movement. If vertical movement exists, it is of very limited extent, so as not to interfere with the feeler entering the slot in the shuttle.

In accordance with my invention I'provide a preferably frictional resistance, which, in the disclosed embodiment of the invention, I apply to the back of the picker stick. Herein I have represented the lay 4 as having an opening therein receiving a suitable short shaft 14 to which is pinned or otherwise secured a cam 15 which, as

herein shown, is positioned at the rear of the picker stick at the replenishment end of the loom in those cases where my invention is applied to a loom of that type, so as to engage therewith or with a leather or like piece 16, thereby to increase the friction and to furnish a renewable part. Fast upon the outer end of the shaft 14c is a drum 17 having radially extending from its surface a pin 18. I provide a strap or other flexible member 19, one end of which is secured by a bracket 20 and the other end of which is secured to a coiled spring 21 itself secured to the lay of the loom at 22. The strap 19 is provided with a hole to receive the pin 18. In operation, the shuttle strikes the picker block 23 of the picker stick, forcing the latter to the right viewing Fig. 2. The picker stick instead of striking the outer end of the picker slot, as in the usual construction, strikes the cam 15 near the tip thereof and at a'suitable point preferably about two inches more or less from the end of the picker stick slot. The rotation of the cam 15 in a contraclockwise direction is resisted by the spring 21, the tension whereof is such as is found most desirable by experience. The bracket 20 permits a ready adjustment of the tension of the said spring. The'cam 15 is so shaped with reference to its angle of application'of force as to require a considerable amount of friction to impart rotative'movement thereto and the development of such friction absorbs the momentum of the shuttle, and for this reason, the shuttle cannot rebound. Viewing Fig. 2, it will be noted that the angle formed by the meeting faces of the picker stick and the cam'15 is a relatively small one. Inasmuch as the spring does not directly resist the impact of the shuttle,

a comparatively small weak spring is sufficient for the purpose.

-Having thus described one illustrative embodiinent of my invention, I desire it to be understood that although specific terms are employed, they are used in a generic and descriptive sense and not for purposes of limitation, the scope of the invention being set forth in the following claims:

1. Picking mechanism for looms comprising in combination, a picker stick and a friotional resistance therefor including a shaft having a cam, a strap passing about said shaft, and a spring engaging said strap, said picker stick being adapted to engage said cam.

2. Picking mechanism for looms compris ing in combination, tory shaft mounted in the rear having: a cam directly mounted thereon a picker stick, a rota- 7 thereof and adapted to be struck by the picker stick, and means including a spring and a strap connected thereto and extending about said shaft to resist movement of the cam by the picker stick.

8. Picking mechanism for looms comprising in combination the lay, a picker stick, a rotatory shaft having a cam directly mounted and fast thereon and a spring operatively connected to said shaft and attached to the lay and adapted to be tensioned by movement of rotation of said cam.

a. Picking mechanism for looms comprising in combination the lay, a picker stick, a rotatory shaft 1 1 having a cam 15 fast thereon, a spring 21 operatively connected to said shaft and cam and also attached to the lay.

5. Picking mechanism for looms comprising in combination, a shaft 1a having a drum 17 and cam 15 thereon, a spring 21 and a strap 19 connected therewith and passing about said drum.

6. Picking mechanism for looms comprising in combination, a picker stick, a shaft rotatably mounted in the lay in the rear of the picker stick and having thereon a drum and a cam, the latter being adapted to be struck by the rear face of the picker stick, and-tensioning means extending about said drum and secured to said lay to resist movement of the cam by the picker stick.

7 Picking mechanism for looms compris ing in combination, a picker stick, a shaft having thereon a drum and a cam, the latter being adapted to be struck by the picker stick, and a strap passing about the drum and confined at its ends. 8. Picking mechanism for looms comprising in combination, a picker stick, a shaft having a cam thereon, a strap extending about said shaft, and means to hold the strap at its ends including a spring adapted to be tensioned by the blow of the picker stick upon the cam.

9. Picking mechanism for looms compris ing in combination, a picker stick, a shaft 14: having a drum 1'? thereon provided with a cam 15, a strap 19 passing. about the drum, and a coil spring 21 connecting said strap to a fixed support.

10. Picking mechanism for looms comprising in combination, a picker stick, a shaft 1 1 having a drum 17 thereon with a cam 15, a strap 19 passing about the drum, and means 20, 21 to secure the ends of the strap to a fixed support.

In testimony whereof, I have signed my name to this specification.

Loms s. BURBANK. 

